I strongly suggest that you do this open assessment as many times as you can until you consistently score 100%. You should also aim to complete it in less than 20 minutes. This is to prepare you for the Professional Scrum Master I assessment which consists of 80 questions and a time limit of only one hour. Some of the questions in the open assessment also appear in the Professional Scrum Master I assessment so, every time you take the open assessment it’s an investment in getting ready for the Professional Scrum Master I assessment.